CN103746554A - High step-up-ratio converter in bidirectional voltage outputting for photovoltaic module - Google Patents
High step-up-ratio converter in bidirectional voltage outputting for photovoltaic module Download PDFInfo
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Abstract
The invention discloses a high step-up-ratio converter in bidirectional voltage outputting for a photovoltaic module. The high step-up-ratio converter comprises two switch tubes, two clamping diodes, two fly-wheel diodes, two output diodes, two clamping capacitors, one voltage-multiplying capacitor, two output capacitors and two coupling inductors, wherein the two coupling inductors are provided with two windings. According to the high step-up ratio converter disclosed by the invention, the coupling inductors are utilized for expanding the voltage gain of the high step-up-ratio converter and reducing the voltage stress of power switch tubes and the diodes, the leakage inductance of the coupling inductors is utilized for realizing zero-current switching of the switch tubes and restraining inverse restoring current of the diodes, a clamping circuit formed by the clamping diodes and the clamping capacitors is capable of effectively absorbing the voltage spike when a main switch tube is switched off and realizing the lossless transfer of energy, a voltage-multiply circuit is utilized for further increasing the gain of the high step-up-ratio converter and further reducing the voltage stress of the power switch tubes and the output diodes, the circuit control is convenient, the ripple of the input current is small, and the high step-up ratio converter is suitable for a photovoltaic grid-connected power generation conversion occasion in larger power, high gain and high efficiency.
Description
Technical field
The present invention relates to a kind of DC-to-DC converter and application, is the high step-up ratio converter of photovoltaic module bi-directional voltage output specifically.
Background technology
In solar power system, because the output voltage of monolithic solar cell is lower, and the inversion grid connection required voltage that generates electricity is higher, therefore needs one-level DC-to-DC converter that low voltage and direct current is converted to and is applicable to grid-connected high-voltage direct-current electricity.In distributed solar energy electricity generating plan, the power capacity of monolithic solar cell is less, but having relatively high expectations to efficiency.Therefore how to realize high-gain, high efficiency single-stage converter, significant for the development that promotes photovoltaic industry.
The voltage gain of conventional crisscross parallel booster type Boost DC-DC converter only determines by duty ratio, and voltage gain is limited, is difficult to meet the conversion requirement of high-gain.The voltage stress of power switch pipe is larger, is difficult to adopt the high performance switching tube of low pressure to reduce conduction loss.And converter is operated in hard switching state, switching loss is larger.In order to realize the soft switch motion of Boost converter, in recent years, some have in succession been studied by being attached with the soft switch solution of source power switch or passive device, although these circuit have been realized soft switch motion, but can not reduce the voltage stress of switching tube, can not realize the high-gain conversion of system.For the voltage gain of Lifting Transform device, a kind of scheme is the scheme that adopts switching capacity, but the required switching tube quantity of this scheme is more, has increased system cost; Other scheme is to adopt three complicated winding coupled inductance schemes, and the shortcoming of this scheme is coupling inductance complex structure, is unfavorable for industrial processes, is difficult to guarantee the consistency of circuit.
Summary of the invention
The present invention will overcome the above-mentioned shortcoming of prior art, provides a kind of simple in structure, controls the high step-up ratio converter of the photovoltaic module bi-directional voltage output of convenient and noenergy loss.
A high step-up ratio converter for bi-directional voltage output for photovoltaic module, comprises Boost booster circuit unit, voltage-multiplying circuit unit and output circuit unit, comprising:
In the Boost boosting unit of converter, the first end of the first winding is connected with the first end of the second winding and the positive pole of power supply, the second end of the first winding is connected with the drain electrode of the first switching tube, the second end of the second winding is connected with the drain electrode of second switch pipe, the source electrode of the first switching tube is connected with the source electrode of second switch pipe and the negative pole of power supply, the anode of the first clamping diode is connected with the drain electrode of the first switching tube, the negative electrode of the first clamping diode is connected with the first end of the first clamping capacitance, the first end of the second clamping capacitance is connected with the drain electrode of second switch pipe, the second end of the second clamping capacitance is connected with the anode of the second clamping diode, the second end of the first clamping capacitance is connected with the negative electrode of the second clamping diode and the negative pole of power supply,
Voltage-multiplying circuit unit in converter comprises,
A) multiplication of voltage series arm, by the tertiary winding and the 4th winding and multiplication of voltage capacitances in series, formed, wherein the first winding and the tertiary winding are all two windings in a coupling inductance, the second winding and the 4th winding are all two windings in another coupling inductance, take the first end of the first winding and the first end of the second winding, as reference, hold, the tertiary winding is connected with Same Name of Ends or different name end with reference to end in the 4th winding;
B) the first fly-wheel diode being connected with multiplication of voltage series arm and the second fly-wheel diode, the sun level of the first described fly-wheel diode is connected with the first end of the first clamping capacitance, the negative electrode of the first described fly-wheel diode is connected with the first end of multiplication of voltage series arm, the cathode of the second described fly-wheel diode is connected with the second end of the second clamping capacitance, and the anode of the second described fly-wheel diode is connected with the second end of multiplication of voltage series arm;
In output circuit unit in converter, the anode of the first output diode is connected with the negative electrode of the first fly-wheel diode, the negative electrode of the first output diode is connected with the first end of the first output capacitance, the second end of the first output capacitance is connected with the negative pole of input power, the second output diode negative electrode is connected with the anode of the second fly-wheel diode, the anode of the second output diode is connected with the second end of the second output capacitance, and the first end of the second output capacitance is connected with the negative pole of input power.
Described converter, the one or more synchronous rectifiers that make in its first clamping diode, the second clamping diode, the first fly-wheel diode, the second fly-wheel diode, the first output diode and the second output diode, all can normally work.
During converter work of the present invention, utilize the transformer action of coupling inductance to expand converter voltage gain, reduced the voltage stress of power switch pipe and diode, reduced the conduction loss of power device.The introducing of voltage-multiplying circuit unit has further improved the voltage gain of circuit and has reduced the voltage stress of device; Utilize the leakage inductance of coupling inductance to realize the zero current turning-on of power switch pipe; Utilize the leakage inductance of coupling inductance also to realize the soft shutoff of fly-wheel diode and output diode simultaneously; Clamping diode naturally turn-offs and has reduced switching loss, and utilizes clamp switch pipe and clamping capacitance to absorb the energy of leakage inductance, no-voltage spike when main switch is turn-offed, and the leakage inductance energy absorbing is finally delivered to load, realizes Lossless Snubber; Its circuit structure symmetry, naturally sharing current, it is convenient to control, and input current ripple is little, is applicable to relatively high power, high-gain and the high efficiency distributed photovoltaic occasion of generating electricity by way of merging two or more grid systems.
Advantage of the present invention is: without extra power switch and inductance element, attachment element is few, simple in structure, it is convenient to control, noenergy losser in circuit, can improve the efficiency of circuit, and in commutation course, no-voltage overshoot when power switch pipe turn-offs, no current overshoot when fly-wheel diode is opened.Coupling inductance transferring energy all when corresponding switching tube turns on and off, has improved the utilance of coupling inductance, has reduced the volume of coupling inductance, can realize generating positive and negative voltage output, more applicable and application scenario that three-level inverter coordinates.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the high step-up ratio converter of photovoltaic module of the present invention bi-directional voltage output;
Embodiment
Referring to Fig. 1, the high step-up ratio converter of bi-directional voltage output for photovoltaic module of the present invention, comprises Boost booster circuit unit, voltage-multiplying circuit unit and output circuit unit.
In the Boost booster circuit unit of converter, the first end of the first winding L 1 is connected with the first end of the second winding L 2 and the positive pole of power supply Vin, the second end of the first winding L 1 is connected with the drain electrode of the first switching tube S1, the second end of the second winding L 2 is connected with the drain electrode of second switch pipe S2, the source electrode of the first switching tube S1 is connected with the source electrode of second switch pipe S2 and the negative pole of power supply Vin, the anode of the first clamping diode Dc1 is connected with the drain electrode of the first switching tube S1, the negative electrode of the first clamping diode Dc1 is connected with the first end of the first clamping capacitance Cc1, the first end of the second clamping capacitance Cc2 is connected with the drain electrode of second switch pipe S2, the second end of the second clamping capacitance Cc2 is connected with the anode of the second clamping diode Dc2, the second end of the first clamping capacitance Cc1 is connected with the negative pole of the negative electrode of the second clamping diode Dc2 and power supply Vin,
The voltage-multiplying circuit unit of converter comprises,
A) multiplication of voltage series arm, in series by tertiary winding L3 and the 4th winding L 4 and multiplication of voltage capacitor C m, wherein the first winding L 1 and tertiary winding L3 are all two windings in a coupling inductance, the second winding L 2 and the 4th winding L 4 are all two windings in another coupling inductance, take the first end of the first winding L 1 and the first end of the second winding L 2, as reference, hold, tertiary winding L3 is connected with Same Name of Ends or different name end with reference to end in the 4th winding L 4;
B) the first sustained diode r1 being connected with multiplication of voltage series arm and the second sustained diode r2, the sun level of the first described sustained diode r1 is connected with the first end of the first clamping capacitance Cc1, the negative electrode of the first described sustained diode r1 is connected with the first end of multiplication of voltage series arm, the cathode of the second described sustained diode r2 is connected with the second end of the second clamping capacitance Cc2, and the anode of the second described sustained diode r2 is connected with the second end of multiplication of voltage series arm;
In the output circuit unit of converter, the anode of the first output diode Do1 is connected with the negative electrode of the first sustained diode r1, the negative electrode of the first output diode Do1 is connected with the first end of the first output capacitance Co1, the second end of the first output capacitance Co1 is connected with the negative pole of input power Vin, the negative electrode of the second output diode Do2 is connected with the anode of the second sustained diode r2, the anode of the second output diode Do2 is connected with the second end of the second output capacitance Co2, and the first end of the second output capacitance Co2 is connected with the negative pole of input power Vin.
Photovoltaic module has four kinds of courses of work with the high step-up ratio converter of bi-directional voltage output in a switch periods, and the first switching tube S1 turn-offs the change of current between the first clamping diode Dc1 conducting; The opening process of the first switching tube S1, second switch pipe S2 turn-offs the change of current between the second clamping diode Dc2 conducting; The opening process of second switch pipe S2.
The first switching tube S1 turn-offs the change of current between the first clamping diode Dc1 conducting:
Before the change of current, circuit is in the first switching tube S1 and second switch pipe S2 conducting, the steady-working state that the first clamping diode Dc1, the second clamping diode Dc2, the first sustained diode r1, the second sustained diode r2, the first output diode Do1 and the second output diode Do2 turn-off.When the first switching tube S1 turn-offs, the first clamping diode Dc1 is open-minded, due to the effect of the first clamping capacitance Cc1, the first switching tube S1 both end voltage is certain voltage value by clamp, the first sustained diode r1 and the second sustained diode r2 are open-minded simultaneously, to multiplication of voltage capacitor C m charging, after the electric current of the first winding L 1 drops to zero, the first clamping diode Dc1 turn-offs naturally.
The process that the first switching tube S1 opens:
Open the control side that signal is added in the first switching tube S1, the first switching tube S1 is open-minded, and due to the rising of starting from scratch of the electric current of the first winding L 1, therefore the first switching tube S1 has realized zero current turning-on.The electric current of multiplication of voltage series arm starts to decline, and when electric current drops to zero, the first sustained diode r1 and the second sustained diode r2 turn-off, and circuit is got back to initial steady-working state, to the magnetizing inductance charging of two coupling inductances.
Second switch pipe S2 turn-offs the change of current between the second clamping diode Dc2 conducting:
When second switch pipe S2 turn-offs, the second clamping diode Dc2 is open-minded, due to the effect of the second clamping capacitance Cc2, second switch pipe S2 both end voltage is certain voltage value by clamp, the first output diode Do1 and the second output diode Do2 are open-minded simultaneously, multiplication of voltage capacitor C m, tertiary winding L3 and the 4th winding L 4 are to the first output capacitance Co1 and the second output capacitance Co2 transferring energy, and after the electric current of the second winding L 2 drops to zero, the second clamping diode Dc2 turn-offs naturally.
The process that second switch pipe S2 opens:
Open the control side that signal is added in second switch pipe S2, S2 is open-minded for second switch pipe, and due to the rising of starting from scratch of the electric current of the second winding L 2, therefore second switch pipe S2 has realized zero current turning-on.The electric current of multiplication of voltage series arm starts to decline, and when electric current drops to zero, the first output diode Do1 and the second output diode Do2 turn-off, and circuit is got back to initial steady-working state, to the magnetizing inductance charging of two coupling inductances.
Claims (2)
1. a high step-up ratio converter for bi-directional voltage output for photovoltaic module, comprises Boost booster circuit unit, voltage-multiplying circuit unit and output circuit unit, it is characterized in that:
In described Boost booster circuit unit, the first end of the first winding L 1 is connected with the first end of the second winding L 2 and the positive pole of power supply Vin, the second end of the first winding L 1 is connected with the drain electrode of the first switching tube S1, the second end of the second winding L 2 is connected with the drain electrode of second switch pipe S2, the source electrode of the first switching tube S1 is connected with the source electrode of second switch pipe S2 and the negative pole of power supply Vin, the anode of the first clamping diode Dc1 is connected with the drain electrode of the first switching tube S1, the negative electrode of the first clamping diode Dc1 is connected with the first end of the first clamping capacitance Cc1, the first end of the second clamping capacitance Cc2 is connected with the drain electrode of second switch pipe S2, the second end of the second clamping capacitance Cc2 is connected with the anode of the second clamping diode Dc2, the second end of the first clamping capacitance Cc1 is connected with the negative pole of the negative electrode of the second clamping diode Dc2 and power supply Vin,
Described voltage-multiplying circuit unit comprises,
A) multiplication of voltage series arm, in series by tertiary winding L3 and the 4th winding L 4 and multiplication of voltage capacitor C m, wherein the first winding L 1 and tertiary winding L3 are all two windings in a coupling inductance, the second winding L 2 and the 4th winding L 4 are all two windings in another coupling inductance, take the first end of the first winding L 1 and the first end of the second winding L 2, as reference, hold, tertiary winding L3 is connected with Same Name of Ends or different name end with reference to end in the 4th winding L 4;
B) the first sustained diode r1 being connected with multiplication of voltage series arm and the second sustained diode r2, the sun level of the first described sustained diode r1 is connected with the first end of the first clamping capacitance Cc1, the negative electrode of the first described sustained diode r1 is connected with the first end of multiplication of voltage series arm, the cathode of the second described sustained diode r2 is connected with the second end of the second clamping capacitance Cc2, and the anode of the second described sustained diode r2 is connected with the second end of multiplication of voltage series arm;
In described output circuit unit, the anode of the first output diode Do1 is connected with the negative electrode of the first sustained diode r1, the negative electrode of the first output diode Do1 is connected with the first end of the first output capacitance Co1, the second end of the first output capacitance Co1 is connected with the negative pole of input power Vin, the negative electrode of the second output diode Do2 is connected with the anode of the second sustained diode r2, the anode of the second output diode Do2 is connected with the second end of the second output capacitance Co2, and the first end of the second output capacitance Co2 is connected with the negative pole of input power Vin.
2. the high step-up ratio converter of bi-directional voltage output for photovoltaic module as claimed in claim 1, it is characterized in that, one or more synchronous rectifiers that make in the first clamping diode Dc1, the second clamping diode Dc2, the first sustained diode r1, the second sustained diode r2, the first output diode Do1 and the second output diode Do2, all can normally work.
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Cited By (9)
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| CN106936309A (en) * | 2017-03-29 | 2017-07-07 | 天津大学 | For the input-series and output-parallel gain voltage boosting dc converter wide of fuel cell |
| CN107634645A (en) * | 2017-11-13 | 2018-01-26 | 厦门大学 | A kind of output branch structure based on coupling inductance |
| CN108696137A (en) * | 2018-06-06 | 2018-10-23 | 三峡大学 | A kind of modularization height boosting isolated form DC/DC converters containing active clamping circuir |
| CN108768163A (en) * | 2018-07-27 | 2018-11-06 | 国网辽宁省电力有限公司铁岭供电公司 | Dual input high-gain Boost |
| CN109120154A (en) * | 2018-09-21 | 2019-01-01 | 嘉兴爱索乐信息技术有限公司 | A kind of low voltage output circuit and application |
| CN109560702A (en) * | 2018-12-19 | 2019-04-02 | 青岛理工大学 | Direct-current three-level boost converter fusing coupling inductance technology |
| CN110912407A (en) * | 2019-11-19 | 2020-03-24 | 中国船舶重工集团公司第七一九研究所 | Novel wide-range high-frequency direct current conversion device |
| CN112583260A (en) * | 2019-09-27 | 2021-03-30 | 株洲中车时代电气股份有限公司 | Voltage stabilizing circuit, converter and rail train |
| CN114825933A (en) * | 2022-05-06 | 2022-07-29 | 江南大学 | Direct-current three-level Buck-Boost converter for photovoltaic power generation |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106936309A (en) * | 2017-03-29 | 2017-07-07 | 天津大学 | For the input-series and output-parallel gain voltage boosting dc converter wide of fuel cell |
| CN107634645A (en) * | 2017-11-13 | 2018-01-26 | 厦门大学 | A kind of output branch structure based on coupling inductance |
| CN108696137A (en) * | 2018-06-06 | 2018-10-23 | 三峡大学 | A kind of modularization height boosting isolated form DC/DC converters containing active clamping circuir |
| CN108696137B (en) * | 2018-06-06 | 2023-10-27 | 三峡大学 | Modularized high-boost isolation type DC/DC converter with active clamping circuit |
| CN108768163B (en) * | 2018-07-27 | 2024-02-02 | 国网辽宁省电力有限公司铁岭供电公司 | Dual-input high-gain Boost converter |
| CN108768163A (en) * | 2018-07-27 | 2018-11-06 | 国网辽宁省电力有限公司铁岭供电公司 | Dual input high-gain Boost |
| CN109120154A (en) * | 2018-09-21 | 2019-01-01 | 嘉兴爱索乐信息技术有限公司 | A kind of low voltage output circuit and application |
| CN109120154B (en) * | 2018-09-21 | 2024-04-02 | 嘉兴爱索乐信息技术有限公司 | Low-voltage output circuit and application |
| CN109560702A (en) * | 2018-12-19 | 2019-04-02 | 青岛理工大学 | Direct-current three-level boost converter fusing coupling inductance technology |
| CN109560702B (en) * | 2018-12-19 | 2024-03-22 | 南京信息工程大学 | DC three-level boost converter integrating coupling inductance technology |
| CN112583260A (en) * | 2019-09-27 | 2021-03-30 | 株洲中车时代电气股份有限公司 | Voltage stabilizing circuit, converter and rail train |
| CN110912407A (en) * | 2019-11-19 | 2020-03-24 | 中国船舶重工集团公司第七一九研究所 | Novel wide-range high-frequency direct current conversion device |
| CN110912407B (en) * | 2019-11-19 | 2022-11-04 | 中国船舶重工集团公司第七一九研究所 | Wide-range high-frequency direct current conversion device |
| CN114825933A (en) * | 2022-05-06 | 2022-07-29 | 江南大学 | Direct-current three-level Buck-Boost converter for photovoltaic power generation |
| CN114825933B (en) * | 2022-05-06 | 2024-05-10 | 江南大学 | DC three-level Buck-Boost converter for photovoltaic power generation |
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Address after: Hangzhou City, Zhejiang province 310005 Gongshu District Kang Road No. 18 building 11 floor Patentee after: Hangzhou Hemai Power Electronics Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310005 Gongshu District Kang Road No. 18 building 11 floor Patentee before: HOYMILES CONVERTER TECHNOLOGY Co.,Ltd. |